000			04244nam a22005657a 4500
001			G80114
003			MX-TxCIM
005			20230704201319.0
008			121211s ||||f| 0 p|p||0|| |
020			_a970-648-120-6
040			_aMX-TxCIM
072		0	_aE16
072		0	_aF01
090			_aCIS-4180
100	1		_aDiallo, A.O. _uIntegrated Approaches to Higher Maize Productivity in the New Millennium; 7. Proceedings of the Eastern and Southern Africa Regional Maize Conference; Nairobi (Kenya); 5-11 Feb 2002
110	0		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT) Kenya
245	0	0	_aDrought and low nitrogen tolerant hybrids for the moist mid-altitude ecology of Eastern Africa
260			_aNairobi (Kenya) _bKARI|CIMMYT : _c2002
300			_ap. 206-212
340			_aPrinted
520			_aMaize is the principal food staple of the rural and urban poor of eastern and central Africa, constituting > 50% of the caloric intake derived from cereals in the region. Drought and low soil fertility are among the most important constraints to maize production even in the high potential moist mid-altitude eco-zone. This zone. generally falling within the altitudinal range of 1000-1800 masl and characterized by rainfall of >500 mm and mean temperature of 21.5°C. comprises a total area of approximately 500.000 hectares in Kenya alone. and is among the most densely populated regions on the continent. Though of high potential productivity. fertilizer use is constrained by high costs and lack of credit for small holders. Maize productivity in maize-based cropping systems could be greatly improved using varieties that utilize nitrogen (N) from fertilizers and other sources more efficiently as well as tolerating the periodic moisture stress. Farmers in this region have shown a preference for hybrid maize varieties. The objective of the research described here was to develop hybrid maize varieties adapted this ecoloy that are tolerant of low soil fertility and drought. Drought and low N tolerant inbred lines developed by CIMMYT -Harare in collaboration with CIMMYT Mexico were crossed with two streak resistant testers (CML202 and CML206) during the 1997-98 minor season. In 1999. the resulting crosses were evaluated across 7 sites and compared with local checks under both stressed (managed drought and low N) and unstressed conditions. The selected best single cross hybrids were crossed with 2 other testers (CML78 and CML384) in 2000 and the resulting 3 way-hybrids were evaluated as in 1999. Grain yield and secondary traits such as Anthesis-Silking Interval (ASI). leaf sencscence. and number of ears per plant were used to select the most promising materials. Eight drought and low N tolerant 3-way hybrids were identified which yield 24, 15 and 64'% more than the best commercial hybrid checks under optimum. low N and drought stress conditions. respectively These hybrids have the potential to increase yields. reduce input requirements and improve yield stability for resource-poor farmers in densely populated high potential eco-zones of Eastern and Southern Africa.
536			_aGlobal Maize Program|Research and Partnership Program
546			_aEnglish
591			_a0409|AGRIS 0401|AL-Maize Program
593			_aJuan Carlos Mendieta
594			_aINT1888|INT2460|CFDE01
595			_aCSC
650	1	7	_aCrop yield _gAGROVOC _2 _91066
650	1	0	_aDrought resistance
650	1	7	_aInbred lines _gAGROVOC _2 _91155
650	1	7	_aMaize _gAGROVOC _2 _91173
650	1	0	_aNitrogen content
650	1	0	_aRainwater
650	1	0	_aSeed product
650	1	7	_aSmall farms _gAGROVOC _2 _91260
653	0		_aCIMMYT
653	0		_aKARI
650	1	0	_91952 _aSoil fertility _gAGROVOC
650	1	0	_91151 _aHybrids _gAGROVOC
700	1		_aChivatsi, W.S., _ecoaut.
700	1		_aFriesen, D.K., _ecoaut.
700	1		_aFriesen, D.K.|Palmer, A.F.E.
700	1		_aKikafunda, J., _ecoaut. _91931
700	1		_aMduruma, Z.O., _ecoaut.
700	1		_aOdongo, O., _ecoaut.
700	1		_aWolde, L., _ecoaut.
700	1		_aMugo, S.N. _gFormerly Global Maize Program _8INT2460 _9840
700	1		_aBanziger, M. _gResearch & Partnership Program _gExcellence in Breeding _8INT1888 _9834
942			_cPRO
999			_c7336 _d7336